docs: def mkNonce(when=None):
      """Generate a nonce with the current timestamp
  
      @param when: Unix timestamp representing the issue time of the
          nonce. Defaults to the current time.
      @type when: int
  
      @returntype: str
      @returns: A string that should be usable as a one-way nonce
  
      @see: time
      """
      salt = cryptutil.randomString(6, NONCE_CHARS)
      if when is None:
          t = gmtime()
      else:
          t = gmtime(when)
  
      time_str = strftime(time_fmt, t)
      return time_str + salt